Sergeant Bluff leans Republican by roughly 30 points: about 35% of voters vote Democratic and 65% Republican.
About 88% of adults in Sergeant Bluff typically vote, above the U.S. average of about 62%. Among adults in Sergeant Bluff, ~31% vote Democratic, ~57% Republican, and ~12% don't vote. The map below shows estimated turnout by block group.
How Sergeant Bluff compares
Among cities within 25 miles, Sergeant Bluff leans more Republican than 5 of 35 neighbors.
Sergeant Bluff runs about 16 points more Republican than Iowa as a whole.
Politics vary noticeably by neighborhood within Sergeant Bluff. The southeast side is the most Republican-leaning (R+35) and the north side is the least Republican-leaning (R+24), a spread of about 11 points.
Why Sergeant Bluff leans the way it does
This analysis examined 14,881 data points per city to find what predicts political lean and turnout. The items below are a few correlations that stood out for Sergeant Bluff, not a ranked or complete list of what matters most.
Sergeant Bluff votes Republican even though it is densely developed (about 72%, far above the Iowa average of 16%). State and regional patterns outweigh the Democratic lean that density usually predicts here. A high family-household share predicts Republican voting, and about 79% of households in Sergeant Bluff are family households, above 87% of cities.
Walkability and Democratic lean
Places with a highly walkable street grid tend to lean Democratic; Sergeant Bluff, IA sits in the top tenth nationally on this measure. A walkable street grid does not change how people vote; it mostly reflects how urban a place is.
Why turnout in Sergeant Bluff looks the way it does
Areas with strong routine healthcare access turn out at higher rates. Sergeant Bluff is in the top quarter nationally for routine-care measures such as insurance coverage, preventive screenings, and dental visits. The dental-visit rate here is about 69%, about 9 points above the U.S. average of 60%. High high-school completion lines up with higher turnout, and about 96% of adults in Sergeant Bluff have completed high school, above 86% of cities. Learn more about the findings and methodology on the political spectrum map.
Nearby Cities
- Dakota City, NE R+40
- South Sioux City, NE R+4
- Salix, IA R+50
- Sioux City, IA R+3
- Bronson, IA R+51
- Owego, IA R+50
- Homer, NE R+53
- Lawton, IA R+50
- North Sioux City, SD R+38
- Hubbard, NE R+55
Cities with Similar Populations
- Newfane, NY R+33
- Southampton, MA Even
- Locust Grove, VA R+25
- Tuscola, IL R+44
- Armona, CA R+19
- Bourg, LA R+78
- Sandown, NH R+15
- Stonewall, LA R+75
- Bailey, CO R+17
- Citra, FL R+46
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Sources and methodology
Precinct-level voting records used to fit the model come from Iowa Secretary of State, Elections, distributed by the Voting and Election Science Team. Demographic inputs come from the U.S. Census Bureau (ACS 5-year estimates and the 2020 Decennial Census). Health and environmental inputs come from the CDC (PLACES and the Environmental Justice Index). Land cover comes from the USGS and EPA. Election-day and lead-up weather come from PRISM 4km daily grids and the NOAA Global Historical Climatology Network. Mail-voting and election-administration patterns come from the MIT Election Lab's Survey of the Performance of American Elections. Block-group crime detail comes from CrimeGrade. Internet data and modeling support provided by ISPreports.org.
Modeling and analysis by the BestNeighborhood data science team. Full methodology and findings: political spectrum map.
Methodology reviewed by the BestNeighborhood data team. Last updated May 2026.